Apcalc

[Mobhack]

weapon 61 has warhead 44 - an obvious error that contributes to the penetration. Likely a double tap of 4, many years ago. Something to fix for the next release.

HEAT (and AP) are an average of 1000 shots per range bucket. HEAT is very variable - look at best HEAT as an example (best shot of the sample of 1000). HEAT can use fail or not fully develop, especially WW2 vs MBT HEAT ammo, and in rare cases can over penetrate. So a reliable figure of 4 for that weapon is well within the bounds.

[DRG]

Originally Posted by Mobhack

weapon 61 has warhead 44 - an obvious error that contributes to the penetration. Likely a double tap of 4, many years ago. Something to fix for the next release.

Now corrected. Error traced to 2016. certainly the result of a double tap of 4. WH size had been 5 and should have been 4

[Kiwikkiwik]

Actually this is not caused by variation, which I hoped to show with the AP results comparison.
Anyway,
If you look at the first 10 HEAT weapons in the German OOB you get this. These are weapon number, apcalc HEAT penetration value and mobhack HEAT penetration value,
21,3,4,22,3,4,23,3,4,31,4,5,32,4,5,33,6,7,35,2,3,3 6,6,7,41,8,9,42,4,5.
Yes there it is, the Mobhack value is always exactly one more than the Apcalc value, and again for every one of these weapons with an AP penetration the AP penetrations match perfectly in both applications.

To me it appears that one of the applications is right and one is wrong.

So again I don't know if this is a problem, but the chances of this being random are, well pretty unlikely.